IANA tz database · zone identifier

Asia/Tehran

The IANA tz database identifier for Iran Standard Time in Iran. Store this string — not the abbreviation, not the offset — and your timestamps stay correct forever.

UTC+03:30Abbreviation +0330No DST — never observed
Time in Asia/Tehran☾ Night
02:25:19
Thursday, July 16, 2026
Offset
UTC+03:30
Abbreviation
+0330
DST
No DST

Current offset

UTC+03:30

same year-round

Abbreviation

+0330

tzdb uses numeric abbreviations here

DST behaviour

Never

has never observed daylight saving

Country

🇮🇷 Iran

ISO 3166: IR · view country page →

Using this identifier

The string to put in your code.

Asia/Tehran is the identifier to use in code and config for this region. Every modern language, database, and OS resolves it through the same tz database, so the examples here behave identically everywhere.

Avoid storing +0330 or +03:30 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

// format a date in this zone
new Intl.DateTimeFormat('en-US', {
timeZone: 'Asia/Tehran',
dateStyle: 'full', timeStyle: 'long'
}).format(new Date());

Offset & DST behaviour

One offset,
3 years.

Asia/Tehran has kept UTC+03:30 year-round since 21 September 2022 — no daylight saving and no offset changes on record since. It is among the most stable identifiers in the database.

Every offset this zone has kept

+03:25:44UTC+03:30 · UNCHANGED 21 September 2022 NOW

Keeping this offset since

21 September 2022

Next transition

None scheduled

no DST rules exist for this zone

Safe to assume

Local = UTC + 3:30h, always

…but store the identifier anyway

Technical record

The database entry, in full.

source: IANA tz database

IdentifierAsia/Tehran
ISO country codeIR🇮🇷 Iran
Reference coordinates35.67°N, 51.43°Etz database reference point
Standard offsetUTC+03:30abbreviation +0330
Daylight offset—daylight saving has never been observed

Where it applies

All of Iran, one clock.

Looking for travel-friendly info? See Tehran or Iran Standard Time.

🇮🇷
Iran

92M people, one time zone. The whole country resolves to Asia/Tehran.

Country page →
🇮🇷 Tehran
02:25
02:25:19 · +0330
pop. 8.7MIRST
🇮🇷 Mashhad
02:25
02:25:19 · +0330
pop. 3MIRST
🇮🇷 Isfahan
02:25
02:25:19 · +0330
pop. 2MIRST

Frequently asked questions

Answers specific to this identifier — generated from the database record. Can't find what you need? Email [email protected].

What UTC offset is Asia/Tehran?
Asia/Tehran is UTC+03:30, year-round. The offset never changes because the zone does not observe daylight saving time.
Does Asia/Tehran observe daylight saving time?
No. Asia/Tehran has never observed DST — it has kept UTC+03:30 continuously since 21 September 2022.
Which country uses Asia/Tehran?
Iran. The identifier covers the whole country.
Is Asia/Tehran the same as IRST?
Asia/Tehran is one of the IANA zones that keeps Iran Standard Time (IRST). Use Asia/Tehran in software — IRST is a human-friendly label, not a valid identifier.

Free · Developer API

This zone, as JSON.

Everything on this page — offset, abbreviation, DST rules, coordinates — from one endpoint, always current with the latest tzdb release.

GET /v1/timezones Live

countries, cities, convert, DST transitions coming next.

Get your free API key →
// this identifier, resolved live
GET /v1/timezones?iana=Asia/Tehran
{
"iana": "Asia/Tehran",
"utc_offset": "+03:30",
"abbreviation": "+0330",
"observes_dst": false,
"country": "IR"
}